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Problem defining a struct

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Old 10-06-2011
Problem defining a struct
I have the following code and getting the compilation errors

Code:
baseLib/DynBaseObj.h:80: error: expected constructor, destructor, or type conversion before ‘(' token
baseLib/DynBaseObj.h:89: error: expected constructor, destructor, or type conversion before ‘(' token
baseLib/DynBaseObj.h:101: error: expected constructor, destructor, or type conversion before ‘(' token

Code:
///////////////////////////////////////////////////////////////////////////
//
//  --Module---------------------------------------------------------------
//
//                           <<struct> DynBaseObj
//
//                 Creates object with a value and a pointer.
//
//  --Attributes-----------------------------------------------------------
//
//  Value
//    + Value: T
//
//  Prev
//    + Prev: DynBaseObj*
//
//  Next
//    + Next: DynBaseObj*
//
//  --Operations-----------------------------------------------------------
//
//  DynBaseObj
//    + DynBaseObj(val: T)
//    + DynBaseObj(val: T, next: DynBaseObj*)
//    + DynBaseObj(val: T, prev: DynBaseObj*, next: DynBaseObj*)
//
//  --History--------------------------------------------------------------
//
//    V01 - DEC 1999 - Luca D'Auria
//          Initial release.
//    V02 - SEP 2008 - Luca Elia
//          Version fixed for g++ 4.3.0.
//    V03 - MAY 2009 - Christopher Dimech
//          Adopted C++ coding standards based on the IBM Standard C++
//          Library Reference Guide and the Ellementel Telecommunication
//          Systems Laboratory C++ Style Guide.
//    V04 - NOV 2009 - Luca D'Auria
//          Code changes after visit to RISSC-Lab.
//    V05 - JUL 2011 - Christopher Dimech
//          Adopted UML 2.3 for documenting class structure.
//
///////////////////////////////////////////////////////////////////////////

#ifndef DynBaseObj_H
#define DynBaseObj_H

#include <iostream>

#include "gendef.h"
#include "Vector.h"

// ***********************************************************************
// TEMPLATE CLASS: BaseObject
// ***********************************************************************

template <class T>
struct DynBaseObj {

    T  Value;

    DynBaseObj*  Prev;

    DynBaseObj*  Next;

    DynBaseObj(T  val);

    DynBaseObj(
      T  val,
      DynBaseObj*  next);

    DynBaseObj(
      T  val,
      DynBaseObj*  prev,
      DynBaseObj*  next);

};

//////////////////////////////////////////////////////////////////////////

DynBaseObj(T  val) {

  Value = val;
  Prev = Next = NULL;

}

//////////////////////////////////////////////////////////////////////////

DynBaseObj(
  T  val,
  DynBaseObj*  next) {

  Value = val;
  Prev = NULL;
  Next = next;

}

//////////////////////////////////////////////////////////////////////////

DynBaseObj(
  T  val,
  DynBaseObj*  prev,
  DynBaseObj*  next) {

  Value = val;
  Prev = prev;
  Next = next;

}

//////////////////////////////////////////////////////////////////////////

#endif

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